barcodes excel 2003 Multiple Indirection in VS .NET

Creation Quick Response Code in VS .NET Multiple Indirection

Multiple Indirection
QR Code Drawer In .NET
Using Barcode generator for .NET framework Control to generate, create QR Code 2d barcode image in .NET framework applications.
Scan QR Code JIS X 0510 In .NET
Using Barcode recognizer for VS .NET Control to read, scan read, scan image in .NET framework applications.
You can have a pointer point to another pointer that points to the target value This situation is called multiple indirection, or pointers to pointers Pointers to pointers can be confusing Figure 5-3 helps clarify the concept of multiple indirection As you can see, the value of a normal pointer is the address of the object that contains the value desired In the case of a pointer to a pointer, the first pointer contains the address of the second pointer, which points to the object that contains the value desired Multiple indirection can be carried on to whatever extent rquired, but more than a pointer to a pointer is rarely needed In fact, excessive indirection is difficult to follow and prone to conceptual errors Do not confuse multiple indirection with high-level data structures, such as linked lists, that use pointers These are two fundamentally different concepts
Make Barcode In VS .NET
Using Barcode encoder for .NET Control to generate, create bar code image in .NET applications.
Bar Code Reader In .NET Framework
Using Barcode decoder for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
C++: The Complete Reference
Denso QR Bar Code Maker In C#
Using Barcode maker for .NET framework Control to generate, create QR Code 2d barcode image in .NET framework applications.
QR Code 2d Barcode Maker In VS .NET
Using Barcode generator for ASP.NET Control to generate, create Denso QR Bar Code image in ASP.NET applications.
Figure 5-3
Printing Quick Response Code In VB.NET
Using Barcode printer for .NET Control to generate, create QR Code 2d barcode image in Visual Studio .NET applications.
Barcode Creator In Visual Studio .NET
Using Barcode creator for VS .NET Control to generate, create barcode image in Visual Studio .NET applications.
Single and multiple indirection
Make Code 128 Code Set C In .NET
Using Barcode encoder for .NET framework Control to generate, create Code 128C image in .NET framework applications.
2D Barcode Maker In .NET Framework
Using Barcode encoder for Visual Studio .NET Control to generate, create Matrix 2D Barcode image in VS .NET applications.
A variable that is a pointer to a pointer must be declared as such You do this by placing an additional asterisk in front of the variable name For example, the following declaration tells the compiler that newbalance is a pointer to a pointer of type float:
Generate 1D Barcode In .NET
Using Barcode generator for VS .NET Control to generate, create Linear 1D Barcode image in .NET applications.
ISSN - 10 Encoder In Visual Studio .NET
Using Barcode drawer for VS .NET Control to generate, create ISSN - 13 image in .NET applications.
float **newbalance;
GTIN - 13 Recognizer In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
Encode Code 128 Code Set B In C#.NET
Using Barcode maker for .NET framework Control to generate, create Code-128 image in Visual Studio .NET applications.
You should understand that newbalance is not a pointer to a floating-point number but rather a pointer to a float pointer To access the target value indirectly pointed to by a pointer to a pointer, you must apply the asterisk operator twice, as in this example:
Make Code 3 Of 9 In Java
Using Barcode creation for Java Control to generate, create Code-39 image in Java applications.
Decode Code 128C In Visual C#
Using Barcode reader for VS .NET Control to read, scan read, scan image in .NET applications.
#include <stdioh> int main(void) { int x, *p, **q; x = 10; p = &x; q = &p; printf("%d", **q); /* print the value of x */ return 0; }
Recognize Bar Code In .NET Framework
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in Visual Studio .NET applications.
Encode GS1-128 In Java
Using Barcode encoder for Android Control to generate, create GS1 128 image in Android applications.
Here, p is declared as a pointer to an integer and q as a pointer to a pointer to an integer The call to printf( ) prints the number 10 on the screen
Bar Code Generation In None
Using Barcode creation for Microsoft Word Control to generate, create bar code image in Word applications.
Bar Code Decoder In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
5:
Pointers
THE FOUNDATION OF C++: THE C SUBSET
Initializing Pointers
After a nonstatic local pointer is declared but before it has been assigned a value, it contains an unknown value (Global and static local pointers are automatically initialized to null) Should you try to use the pointer before giving it a valid value, you will probably crash your program and possibly your computer's operating system as well a very nasty type of error! There is an important convention that most C/C++ programmers follow when working with pointers: A pointer that does not currently point to a valid memory location is given the value null (which is zero) By convention, any pointer that is null implies that it points to nothing and should not be used However, just because a pointer has a null value does not make it "safe" The use of null is simply a convention that programmers follow It is not a rule enforced by the C or C++ languages For example, if you use a null pointer on the left side of an assignment statement, you still run the risk of crashing your program or operating system Because a null pointer is assumed to be unused, you can use the null pointer to make many of your pointer routines easier to code and more efficient For example, you could use a null pointer to mark the end of a pointer array A routine that accesses that array knows that it has reached the end when it encounters the null value The search( ) function shown here illustrates this type of approach
/* look up a name */ int search(char *p[], char *name) { register int t; for(t=0; p[t]; ++t) if(!strcmp(p[t], name)) return t; return -1; /* not found */ }
The for loop inside search( ) runs until either a match is found or a null pointer is encountered Assuming the end of the array is marked with a null, the condition controlling the loop fails when it is reached C/C++ programmers commonly initialize strings You saw an example of this in the syntax_error( ) function in the section "Arrays of Pointers" Another variation on the initialization theme is the following type of string declaration:
char *p = "hello world";
As you can see, the pointer p is not an array The reason this sort of initialization works is because of the way the compiler operates All C/C++ compilers create
Copyright © OnBarcode.com . All rights reserved.